I have used both the Agnos MrotatorA and MrotatorB and had no problem.
It is possible that the screw (Allen bolt) "may" be bottoming out but I doubt it. Still it is worth checking. I know nothing about the "PVC collar" as neither that I have used were supplied with one. (it may be a new addition?)
When clamping the lenses into the MrotatorA/B it does become very tight and takes a little force to clamp (be very careful only to pull down just enough to stop the lens From being turned by hand) Hearing a creaking sound under the tension in normal.
Let us know how you get on and what the reply from Agnos is.
Regards, Smooth
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